/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.naming;

import java.util.Iterator;

import javax.naming.Binding;
import javax.naming.CompositeName;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;

/**
 * Naming enumeration implementation.
 * 
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 11:17:11 +0800 (星期二, 24 十月
 *          2006) $
 */

public class NamingContextBindingsEnumeration implements NamingEnumeration {

	// ----------------------------------------------------------- Constructors

	public NamingContextBindingsEnumeration(Iterator entries, Context ctx) {
		iterator = entries;
		this.ctx = ctx;
	}

	// -------------------------------------------------------------- Variables

	/**
	 * Underlying enumeration.
	 */
	protected Iterator iterator;

	/**
	 * The context for which this enumeration is being generated.
	 */
	private Context ctx;

	// --------------------------------------------------------- Public Methods

	/**
	 * Retrieves the next element in the enumeration.
	 */
	public Object next() throws NamingException {
		return nextElementInternal();
	}

	/**
	 * Determines whether there are any more elements in the enumeration.
	 */
	public boolean hasMore() throws NamingException {
		return iterator.hasNext();
	}

	/**
	 * Closes this enumeration.
	 */
	public void close() throws NamingException {
	}

	public boolean hasMoreElements() {
		return iterator.hasNext();
	}

	public Object nextElement() {
		try {
			return nextElementInternal();
		} catch (NamingException e) {
			throw new RuntimeException(e.getMessage(), e);
		}
	}

	private Object nextElementInternal() throws NamingException {
		NamingEntry entry = (NamingEntry) iterator.next();

		// If the entry is a reference, resolve it
		if (entry.type == NamingEntry.REFERENCE
				|| entry.type == NamingEntry.LINK_REF) {
			try {
				// A lookup will resolve the entry
				ctx.lookup(new CompositeName(entry.name));
			} catch (NamingException e) {
				throw e;
			} catch (Exception e) {
				NamingException ne = new NamingException(e.getMessage());
				ne.initCause(e);
				throw ne;
			}
		}

		return new Binding(entry.name, entry.value.getClass().getName(),
				entry.value, true);
	}

}
